So naturally talk turned to the late Apple CEO and his relationship with Facebook CEO Mark Zuckerberg.

"Jobs meant an enormous amount to the education of Mark," Graham told Isaacson. "Mark will talk about that until the cows come home."

Graham asked if Jobs ever mentioned Zuckerberg to Isaacson.

"I once asked Jobs who [he] admired in the Valley," Isaacson responded. "Mark's was the first name on his lips."

Jobs admired Zuckerberg for his "intuitive feel" for what Facebook needed next, for his passion and willingness to "do stuff that allows him to be on shifting sands—his willing to cannibalize old things. He felt an odd kinship to Mark," Isaacson said.

The author then noted that "Steve never cracked the code on social—maybe a few people in the room remember Ping."